\section{Introduction: $\alpha$ Altimeter version 3.0}

In this new version, the following modifications were introduced:

\begin{itemize}

\item A computer - altimeter serial communication facility was included, which
enables external modification of rocket flight parameters.

\item Circuitry of the serial interfase that enables this communication.

\item A Windows version of the program that allows communication with the
altimeter.

\end{itemize}

All the information for the construction of a RS232 communication board and
the firmware flow charts are included.
